FIELD: effluent purification systems. SUBSTANCE: sand trap has circular tray which is divided by number of partitions into group of vessels. Tray is installed on movable support and is provided with inlet and outlet troughs adapted for outflow of liquid and removal of sand. Also provided is sensor for determining weight of sand. Sensor has movable insert, lever with counterweight, stops interacting with limit switches, and side holders with ends of ropes fastened to them. Other ends of ropes are secured to eye-lugs installed on tipping-out side wall. EFFECT: high efficiency. 4 dwg
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